Chapter 03 Quiz: Digestion, Absorption, and Transport

The gallbladder stores and concentrates _____.

Bile

Which of the following parts of the intestinal tract prevents the backflow of food from the stomach into the esophagus?

Lower esophageal sphincter

In the adult digestive tract, where do lipases break fat into fragments so that it can be absorbed into the lymph?

Small intestine

Water is absorbed in the intestine through which of the following processes?

Simple diffusion

Which of the following gastrointestinal hormones helps maintain the proper pH of the stomach?

Gastrin

Gastrointestinal (GI) bacteria in the body _____

Produce small amounts of several vitamins.

Pancreatic juices aid digestion and absorption by

Releasing bicarbonate to neutralize gastric acidity.

Which is true of the inner surface of the small intestine?

It is covered with projections called villi.

Which statement accurately describes the absorption of nutrients via facilitated transport?

It requires a specific carrier.

Which of the following organs is the first to receive nutrients that have been absorbed from the digestive tract?

Liver

Which of the following kinds of nutrients does the lymphatic system carry to the bloodstream?

Large fats and fat-soluble vitamins

At which of the following pH levels do the gastrin-producing cells stop secreting acid into the stomach?

1.5

Which of the following nutrients takes the longest to digest?

Fat

Which part of the body is located in the throat and guards the trachea entrance to prevent fluid and food from entering it when a person swallows?

Epiglottis

Which of the following terms applies to the wavelike muscular contractions that move food along the digestive tract?

Peristalsis